And allan mason



(No Model.)

1 J. WILSON & A. MASON. APPARATUS FOR MAINTAINING COMBUSTION IN SECONDARY CHAMBERS OP BOILER OR OTHER FURNACES. No. 438,873.

.7 Patented 0012521, 1890.

IN VENTOR S I ATTORNEY UNITED STATES PATENT ()FFICE.

JOIIN \VILSON, OF NEW YORK, AND ALLAN MASON, OF BROOKLYN, ASSIGN- ORS TO HERBERT ll. SANDERSON, TRUSTEE, OF NEW YORK, N. Y.

APPARATUS FOR MAINTAINING COMBUSTION IN SECONDARY CHAMBERS F BOILER OR OTHER FURNACES.

SPECIFICATION forming part of Letters Patent No. 438,873, dated October 21, 1890.

Application filed March 8, 1888.

To aZZ whom it may concern.-

Be it known that we, JOHN \VILSON, of New York city, and ALLAN MASON, of Brooklyn, Kings county, New York, citizens of the United States, have invented certain new and useful Improvements in Apparatus for Maintaining Combustion in Secondary Chambers of Boiler and other Furnaces; and we do doclare the following to be a full, clear, and exro act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked I5 thereon, which form a part of this specification.

I Our invention relates to boiler and other furnaces in which one or more secondary combustion-chambers are employed with the obzo jects of securing more effectual combustion of the gaseous portions of the fuel and more effective application of the heat than is ob tained with a single combustion-chamber, and is especially designed for the greater and more economical generation of steam inmarine and other boilers through the instrumentality of a secondary combustion-chamber at the rear or opposite end from the primary furnacechamber and communicating with it to receive and consume the unconsumed gases and return the heat products through the upper portion of the boiler; but our invention is also designed, generally, for all similar or other furnaces in which secondary combustion may be advantageously utilized; and it consists of the combination, in a boiler or other furnace, of the primary-combustion-chamber and the secondary combustion-chamber, respectively, located at the extremities of a material part no" of the'heating portion of the furnace, injector apparatus furnishing a continuous supply of fuel elements, as oil, steam, and air, into said primary chamber, separate injector apparatus of fuel elements, as oil or comminuted coal, to the secondary chamber, and burner apparatus in said secondary chamber separately supplied with and burning other like 7 fuel independently of the fuel supplied to the primary chamber, as hereinafter fully described, reference being made to the accompanying drawings, in which- Serial No. 266.566. (No model.)

Figure 1 is a longitudinal sectional elevation of a boiler-furnace, showing the application of an auxiliary hydrocarbon fire in the secondary comlmstion-chamber foreifectual combustion of the gases entering said chamher from the front or primary chamber, in

.which we have in this instance represented apparatus for the use of hydrocarbon fuel and steam. Fig. 2i'sa horizontalsection of asimi- 6o lar furnace in which the auxiliary fire of the secondary chamber is supported in part by hydrocarbon fuel and in part by coal-slack, both introduced with air, the fire in the front furnace being of coal or other fuel, as preferred. Fig. 3 is a longitudinal sectional elevation of a similar furnace in which the auxiliary' fire in the secondary chamber is maintained with coal-slack blown in and burned on a coal fire, which, being an ordinary fire made on acoal-grate to begin with, is snbsequently maintained and continued by the supply of coal-slack, the fire in the front furnace being produced in this instance with hydrocarbon fuel injectcd with steam and air. Fig. 4 is a top view of a burner for oil on an enlarged scale.

\Ve are aware that it has been attempted to consume in secondary chambers such gases as fail of complete combustion in the first 8o chamber, it being supposed that sufficient room being provided the heat of the primary chamber would be sufiieicnt for effecting such combustion; but we find such method is a failure, practically, although it may work at times and under some circumstances; but generally the gases are too much chilled to insure continuous combustioinand when extinguished by fall of temperature or other causes fail to relight even when considerable increase 0 of temperature takes place. Hence we find an auxiliary fire in the secondary chamber an imperative necessity for practical efliciency; but such a fire as is commonly made by intermittent supplies of fuel through the ordinary fire-door will not do, because when w the door is opened it stops the draft in both fires, besides admitting cold air in great excess, and therefore materiallyinterferes with both fires, and if a fan-blower is used to urge the main fire, as is commonly the case with marine boilers, the door cannot be opened without first stopping the fan, and the fan also interferes with magazine feeders and other automatic stokers for the auxiliary fire by forcing more or less gas out through them. To overcome these difficulties and to secure a reliable and' uniform auxiliary fire adapted to insure effectual combustion of the unconsumed gases from the main fire, having a continuous forced supply of fuel elements, as oil, steam, and air, we have contrived a system which comprises the continuous and unobstructed forced supply of the elements of combustion in various forms to the continually-closed secondary chamber in addition to the gases entering it from the main furnace, the arrangement being such that the same is controllable at the front, where the main fire is tended,andso that the apparatus. is applicable to and detachable from ordinary furnaces constructed with a secondary chamfire-tubes ecommunicating betweenthem,also

the return system of tubes f, connecting the secondary chamber with the-smoke-flue g.

In Figs. 1 and 3 we represent an injecting apparatus for the use of oil, steam, and air for combustion in the main furnace, h being a steam-nozzle,.i an air-inlet funnel, and ,9' an oil-feedin g tube, one or more of the latterbein g used to deliver oil on the upper surface of .the steam-nozzle to conduct the oil off the end of the nozzle suitably to mix and atomize o'rvasource of supply,

porize with the steam and air, the steam nozzle j to be suitably connected with the boiler and the oil pipe or pipes to be connected with any with suitable regulatingcocks or other devices, and all being suitably connected with the furnace through the the door of the first combustion-chamber. \Vith this method of producing combustion'in the main chamber a we provide for an auxiliary fire in the secondary chamber 1) by aseries of oil-burners n, supplied with oil and air through the ash-pit and one or more of the fire tubes e by the pipes 0 and Z, and any approved means of injecting them, with which we may also burn coal-slack, to be forced in through a pipe or pipes m by a fan p or other means; or we may use the coal-slack with an ordinary coal fire qto begin with, and to be subsequently maintained by the coalslack alone. a What we claim, and desire tosecure by Let 6 ters Patent, is-- l V The, combination, in a boilenonother furnace,of the primary combustion-chamber and the secondary combustion-chamber respectively located at the extremities of a material part of the heating portion of the-furnace,

injector apparatus furnishing scout-mucus supply of fuel elements, as oil, steam, and air, into said primary chamber, separate injector apparatus of fuel elements, as oil or commihuted coal, to the secondary chamber, and

burner apparatus in said secondary chamber, separately supplied with. and burning other like fuel independently of the fuel supplied a to the primary chamber, substantially as described. i a

In testimony whereof we afiix our signatures in presence of two witnesses.

- J OIIN WILSONL ALLAN MASON.

Witnesses: I

W; J. MORGAN, A. P. THAYER. a 

